Here is my long awaited CAT scraper. There is a video at the end. A little overview of this creation:
I decided to make this when I was looking at Jon Treasure'sCAT 623G Scraper. Which he built in minifig scale. I then looked around the pages, and did not find a motorized version of a scraper. So I instantly decided to make one. I knew I was going to have to order yellow parts because my collection is lacking in that color.
I started building, and decided to use mostly yellow, but prototype the rest with any colors I had. I wanted to make sure to add all the functions of the real one, so I used the biggest tires I have. Tires are usually my "limiting factor" Which means I usually build everything scale to the tires of the vehicle.
While I was building a prototype, I had some problems adding 1 function (the ejector), and thought I was going to have to scrap it, but after a good 6 hrs of working on it, I finally had a break through, and was able to use a rack with gears to make it work.
Here are a few stats on the scraper:
Bowl Dimensions(LxWxD): 5in X 6in X 3in
2 XL motors for drive
1 M motor for steering
1 M motor for lift gate
2 M motor for bowl lift
1 M motor for ejector
Fun fact about the real scraper: It has 2 engines, a CAT C18 Acert (600hp) in the front, and a CAT C15 Acert (451hp) in the rear. Coupled with the 44 cubic yard bowl, these beasts can move some dirt.
Yes, I bought a rechargeable battery.. I really bought it because it is smaller than the normal battery pack.
I used two big LA for the bowl lift. They are not in the same place as the real ones, but they work pretty nice. I had this great idea to mount two motors in the bar that connects the front to the bowl, and they work nicely.
Here you can see the top of the bowl, and the lift gate. I ordered parts from bricklink, and I was pretty impressed with it, I will surely be ordering more parts from there.
Here is that pesky ejector function that I had a hard time making. I came up with this idea to use racks, and gears. I had to mount the motor to the actual moving part, but it works great.
As I am looking at this picture right now, I realize, I left out one important part of this... the rock guard that keeps rocks off of the rear engine. (Face palm) Well I need to fix that, and I need to raise the steering up just a little, maybe Ill fix them and re-post.
This is the bail. It is used for push/pulling. This is a technic where two scrapers are hooked together.
As seen by this photo, this is the push part. the rear scraper pushes the first along. Only the first scraper has it's bowl lowered, so all 4 engines (2per scraper) are put into filling the first bowl. 2 600hp engines, and 2 451hp engines, adds up to
2102hp. Thats a LOT of power..
This is where the pulling comes into effect. The first scraper lifts it's bowl, and the second one drops it's. Then the first scraper pulls the second.
A picture from the top showing the front hooked to the back
I found this picture of two real scrapers push/pulling on flicker.
Interior of the scraper.
The front drive motor is mounted horizontal. Also you can see the gears for the steering motor, I had to gear the motor down with worm gear drive so it would turn. I also had to add the differential to the front wheels so that they would be able to turn with the steering.
The rear motor is mounted vertical. I used a kind of hub system for the wheels, I have the axle drive a large sprocket, which the tire is mounted to, it doesn't do much, but it makes a nice spacer.
View of the rear.
Front.. I think I made it about two studs wider than it should be.
That make's sense because the rechargeable battery box is 7.4v while the regular box is 9v. So a slight degradation in performance is inevitable. I am planning on making a bricklink order, Mainly technic parts, wheels, and body panel's. But as far as I know there's no one on bricklink who sell's the rechargeable box's.
Thanks Jon :) I don't think I would have done this one with out looking at yours.
Quoting John Daniels
Thank you, the rechargeable battery pack works great size wise, I think it might have a little less power than the other one, but I don't have to buy batteries for it. I think its worth it.
Quoting Ray Jacobs
Thanks, I think you should built one too. For the construction equipment, I got to CAT's website, and download their PDF files that have stats on the equipment. They also have wheel base lengths, and such. Very handy, I then search for pictures, usually 3-4 pictures of different angles. Then if all else fails, I ask my dad how it works (He is a mechanic for a construction company)
Quoting Fritz K
Thanks Fritz :) I did like my brick link order, I'm going to order more parts for my John Deere tractor for sure.
Quoting Nick Barrett, Mason McKechnie, geoffrey boulton, Dave Benson, kenneth rattledge, MortalSwordsman, lloyd meli, lone wolf
Thank you all for commenting, and for your support of my MOCs, It really means a lot to read your feedback. :D THANKS!!
I like it
June 23, 2012
excellent model, great functions and very well detailed, nicely done.
Absolutely stunning work here, George! I still can't understand how you've done all of this intricate work. I always love your creations for their spot-on accuracy and detailing. I also am absolutely impressed that everything moves since you used Power Functions! I see you liked your Bricklink order. ;) Keep these awesome MOCs coming! ~Fritz
Rats! You beat me to this vehicle. I had been planning to build one of these. Your scraper is excellent. It achieves both the correct look and realistic functions. I always like a mix of technic and system. What do you use for reference? Photos? Blueprints? Decent photos and blueprints are hard to find.
Wow Great job George! I agree that you made it about two studs to wide. There are some genius solutions in this MOC. I did not know they had two engines. How well does the rechargeable battery box work? Very good design good esthetics and being the first of it's kind on the pages earns you 5-5. Good work!
Absolutely awesome build george!There are so many unique things on this build. The use of lego system parts look phenomenal as they act like a cover for the technic parts. I cant imagine how complicated the the inside might be! The way the bowl cover raises up and down gives it that authentic kind of look. The way you made the bowl emptier move was very clever. The speed it drives is perfect! This was definitely worth the wait george! I hope this thing gets well over a hundred likes! 99999/5
I like it
June 22, 2012
woah, cool scraper. I remember my young days pushing and shoveling dirt with my Tonka trucks :) nice job!